Repositorio Académico de la Universidad de Chile: Recent submissions
Now showing items 44521-44540 of 98886
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(2002)The crystal structure of Na2Si3O7 has been determined by direct methods using integrated intensities of conventional X-ray powder diffraction data and subsequently refined with the Rietveld technique. The title compound ...
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(2002)Pollen analysis of two sediment records from a coastal swamp forest site in the Chilean semiarid region (31°50′S; 71°28′W) shows an alternation of dry and wet phases during the past ∼6100 cal yr B.P. The most prominent ...
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(2002)A new species of lizard, belonging to the montanus group of the genus Liolaemus, is described from the northern Chile. The specimens of the new species were collected in February, 1999 at the Farellones de Tara, Loa Province, ...
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(2002)Endemic taxa are those restricted to a specific area, and could be defined as the exclusive biodiversity of a region. An area of endemism contains taxa found nowhere else and could be catalogued as irreplaceable and of ...
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(Company of Biologists Ltd, 2002)It has been observed that the relationship between locomotor performance and body mass in terrestrial mammals does not follow a single linear trend when the entire range of body mass is considered. Large taxa tend to ...
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(2002)The Palaeoarctic parasitoid Aphidius ervi Haliday (Hymenoptera, Aphidiidae) parasitises legume aphids in its region of origin. In Chile, it parasitises both legume and cereal aphids. This special situation was studied at ...
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(Academic Press Inc., 2002)Central Chile (32-35°S) lies at the northern border of strong Westerly influence and thus exhibits a steep precipitation gradient. Therefore, the palaeoclimatic archives in the region are suitable for detecting past moisture ...
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(2002)Wnt signalling has been implicated in antero-posterior patterning of the vertebrate embryonic body axis and in a number of other developmental processes. One of the downstream effectors of Wnt signalling is the β-catenin ...
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(2002)The production of active microcin E492, a channel-forming bacteriocin, was studied in exponential and stationary phase. The structural gene for this bacteriocin (mceA) is transcribed in exponential as well as in stationary ...
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(Sociedad de Biologia de Chile, 2002)We studied a chronosequence of forest fragments in northern Chiloé Island, southern Chile, with the aim of assessing ecosystem recovery patterns following anthropogenic disturbance. Hypotheses regarding successional trends ...
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(2002)Theoretical studies of the thermolysis of two α-amino acid ethyl esters in the gas phase were carried out using ab initio theoretical methods, at the HF/6-31G(d) and the MP2/6-311 + G(2d,p)//MP2/6-31G(d) levels of theory. ...
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(Polish Academy of Sciences, 2002)The wing morphology of bats is very diverse, and may correlate with energetic, behavioural, and ecological demands. If these demands conflict, wing shape may reflect compromise solutions. In this study, we compared the ...
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(2002)The series of complexes [N3P3(OC6H5)5 OC6H4CH2CN·MCln] PF6, N3P3(OC6H4CH2 CN)6·(MCln)6] (PF6)6, [N3P3(OC6H5)5 OC6H4CH2CN·MCln-1]Cl and [N3P3(OC6H4CH2 CN)6·(MCln-1)6]Cl6, MCln = MnCl2, FeCl3, COCl2, NiCl2, CuCl2 have been ...
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(2002)Induced plant responses may affect the behaviour and growth of the attacking herbivore insect. The aphid Sipha flava (Forbes) produces reddish spots on the infested leaf of its host plant Sorghum halepense (L.). In order ...
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(Sociedad de Biologia de Chile, 2002)Experimental tests were conducted with the lizard Liolaemus tenuis (Tropiduridae), to determine the potential sources of pheromones used in its chemical communication, centered in the phenomenon of self-recognition. During ...
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(Society of Biology of Chile, 2002)The neural crest is induced at the border between the neural plate and the epidermis. A complex set of signals is required for the specification of the crest cells between the epidermis and the neural plate. Here we discuss ...
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Modulation of cytochrome P450 activity in the kidney of rats following long-term red wine exposure (2002)Cytochrome P450 (CYP)-dependent oxidation of lauric acid, p-nitrophenol and ethanol by microsomal fractions of kidney were studied in control rats and in animals given either ethanol, red wine, or alcohol-free red wine for ...
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(2002)The temperate forest of southern South America (TFSSA) has a highly endemic biota with a flora that exhibits one of the highest incidences of biotic pollination (particularly ornithophily) and animal dispersal (particularly ...
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(Sociedad Chilena de Quimica, 2002)A new route to the electron rich pentamethylcyclopetadienyl iron complexes (n5-C5Me5)=Cp*) starting from the commercially available dimer [Cp*Fe(CO)2]2, is presented. Reaction of the dimer with I2 in CH2Cl2, affords the ...
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(Institute of Arctic and Alpine Research, 2002)Postdispersal seed predation in alpine communities has received surprisingly little attention. We evaluate the magnitude of seed predation by ants and avian granivores in the perennial herb Sisyrinchium arenarium through ...
